FM to approve decision task

Dear Experts,

Good day . My business required a program that approve workflows so for that i am using FM SAP_WAPI_DECISION_COMPLETE . It is working quite good with almost every single workflow but I've been stuck at a point from past few weeks . We have a workflow that trigger when some one apply leave from portal instead of ECC so leave workflow land at ECC system now the workflow stuck at Decision Task I have used different FM like SAP_WAPI_DECISION_COMPLETE , SAP_WAPI_SET_WORKITEM_STATUS and SAP_WAPI_WORKITEM_COMPLETE and few others but still i am not able to approve Decision task screen shot is attached need your expert opinion and support as usual.

Thanks

Regards,

Hafiz